Ann Arbor police are searching for a man they believe robbed a Biggby Coffee and a GameStop this week.

On Tuesday, the man walked into a GameStop off Washtenaw Avenue, showed a knife and demanded cash. On Thursday afternoon, a very similar situation occurred at the Biggy Coffee shop on W. Stadium Boulevard.

Ann Arbor Police Detective Bill Stanford says the man walked into Biggby about 4 p.m., went right past the line of customers and straight to the counter with a knife demanding cash from the register.

"He's pretty desperate and dangerous," Stanford said. "We need to get him off the streets."

A kitchen-type knife has been used in both robberies. No one has been injured and no other weapons have been reported.

The man is described as a 6-foot tall black male with light skin, between 160 and 180 pounds, wearing a black or gray hooded sweatshirt with black or gray pants. He is approximately 25 years old.

The man was last seen by witnesses in the area of Jackson Avenue and Stadium Boulevard, near the Biggby.

Anyone who sees the man is encouraged to be cautious around him.

Anyone with information about either of these two incidents is encouraged to call Stanford at 734-323-2628 or Crime Stoppers at 800-SPEAK UP.

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